掺硅粉和粉煤灰的100mpa高强度自流平混凝土试验研究

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1、掺硅粉和粉煤灰的100MPa高强度自流平混凝土试验研究        减少人口稠密区混凝土施工所产生的噪音，混凝土构件的加固，如梁的加高、墙的加厚和柱子的加粗等，采用自流平混凝土应该是解决上述问题的有效途径，本文主要研究高强混凝土的自流平问题。       本文研究所采用的基本原材料是：52.5P·I硅酸盐水泥、中砂或粗砂、5-25mm致密的岩浆岩碎石；掺合料为硅粉和I级粉煤灰；外加剂为NF-2-6缓凝高效减水剂（水剂）。       本文所要讨论的问题是：内掺硅粉和粉煤灰对混凝土混合料流动性和硬化混凝土抗压强度的影

2、响；混凝土28d抗压强度规律；混凝土的后期强度等。 一、内掺硅粉和粉煤灰对混凝土抗压强度和流动性的影响      试验采用正交设计的方法，其因素与水平的安排如表1所示。 表1　因素与水平因素水平水胶比内掺粉煤灰FA（%）内掺硅粉Si（%）10.2615920.28101630.3152340.34030      混凝土的用水量为155kg/m3，NF-2-6掺量4.5%，石子的用量为1000kg/m3。根据试验结果列出正交设计计算表，如表2所示。表2　正交设计计算表序号水胶比硅粉掺量（%）粉煤灰掺量（%）抗压强度（

3、MPa）坍落度(cm)流展度(mm)3d7d28d90d111122.852076.283.4107.8123.5212225.157569.885.2106.9120.5313326.363567.379.6100.2109.7414426.662061.170.884.898.2521225.058066.577.6103.3111.9622124.860567.979.597.8107.7723425.063555.975.099.6101.6824325.662562.769.582.690.7931325.

4、364559.576.096.0106.41032426.265552.172.095.0105.41133124.862061.672.895.098.81234226.158050.560.576.384.01341425.464049.965.687.4106.91442326.062548.664.687.7100.91543225.963055.964.182.697.41644125458049.160.068.478.4龄期372890372890372890406.39770954.61156.214

5、71.41642.0274.4319.0399.7451.9252.1302.6394.5448.7254.8295.7369.0408.4 抗压强度253.0301.6383.3411.9238.4301.3387.4434.5242.7287.4369.1413.8223.7281.3362.3394.6240.7291.5377.4407.5238.1289.7366.5407.7203.5254.3326.1383.6223.4260.8312.1351.3219.0283.4366.8412.168.679

6、.899.9113.063.075.698.6112.263.773.992.2102.163.275.495.8103.059.675.396.8108.660.771.892.3103.455.970.390.698.660.272.994.4101.959.572.491.6101.950.963.681.595.955.865.278.087.854.870.891.7103.0坍落度　/流展度100.8/235098.5/238597.8/2325100.4/2445102.1/2460102.1/2365

7、102.4/2500102.0/2520103.2/2530102.7/2475103.7/2405103.2/255025.2/58824.6/59624.4/58125.1/61125.5/61525.5/59125.6/62525.5/63025.8/63225.7/61925.9/60125.8/638      根据方差分析计算结果，列出方差分析表，如表3所示。 表3　方差分析表考查指标方差来源平方和自由度均方F值显著性R3W/C735.75253245.250825.87☆☆F0.01(3,6)=9.78

8、Si(%)104.4325334.81083.67(☆)F0.25(3,6)=1.78FA(%)165.9125355.30425.83☆F0.05(3,6)=4.76Se56.880069.4800  S1062.977515   R7W/C580.53253193.510836.99☆☆F0.01(3,6)=9.78Si(%)284.432